Experiment 26 Titration Curves of Poly protic Acids To become familiar with cons

Question

Experiment 26 Titration Curves of Poly protic Acids To become familiar with consecutive cquilibria, on constants, OBJECTIVE APPARATUS AND CHEMICALS 150 mL beaker pH meter with electrodes pt plastic bottle with a plastic lid. 100 mL beakers (3) buret, buret clamp, and ring stand 600 mL beaker weighing bottle 25 ml pipet wash bottle ring and wire gauze Bunsen ring stand and ring Chemicals sodium hydroxide solution potassium hydrogen phthalate (o.1 Mor 19 Mstock solution) phenolphthalein indicator unknown solution of a polyprotic solution pH 4.0 acid (approximately 0.1 M standard buffer solution solution) I DISCUSSION In this experiment, you will perform an acid-base titration to determine the dissociation constants of an unknown polyprotic acid, H A. Consider the triprotic acid H3POe. It undergoes the following dissociations in aqueous solution: [I] Poel H1PO4 H20 H,PO H20 [HPO4 T1 The acid HsPO4 possesses three ionizeable protons, and for this reason, it is termed a triprotic acid Section 16.6). If you were to perform a titration of H,PO, with NaoH, the following reactions would occur in turn: [4] [5] NaH PO, +NaoH [6] Copyright c 2012 Pearson Education, Inc.

Explanation / Answer

Part A: It utilise dilution method of preperation of solutions from satndard solution.

It is prepared by N1V1=N2V2 formula.

Part B: It utilse simple neautralisation titration method using suitable indicator. Change in colour indiates enponit of reaction. From that we can determine normality.

Part C: pH metry method is utilised to determine dissociation constant.

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